磁制冷材料Gd5Ge4中的磁玻璃态

山东大学学报(工学版) ›› 2009, Vol. 39 ›› Issue (3): 67-70.

磁制冷材料Gd₅Ge₄中的磁玻璃态

董彤袁淑娟葛军饴洪芳郁黎明曹世勋张金仓

董彤,袁淑娟,葛军饴,洪芳,郁黎明,曹世勋,张金仓：上海大学物理系, 上海 200444; 袁淑娟：南京大学固体微结构实验室, 南京 210093

收稿日期:2008-12-31 出版日期:2009-06-16 发布日期:2009-06-16

The magnetic glass state in the magnetocaloric material Gd5Ge4

DONG Tong, YUAN Shu-juan, GE Jun-yi, HONG Fang, YU Li-ming, CAO Shi-xun, ZHANG Jin-cang

DONG Tong, YUAN Shu-juan, GE Jun-yi, HONG Fang, YU Li-ming, CAO Shi-xun, ZHANG Jin-cang:Department of Physics, Shanghai University, Shanghai 200444, China; YUAN Shu-juan:Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China

Received:2008-12-31 Online:2009-06-16 Published:2009-06-16
About author:DONG Tong(1981-), female, born in Shandong Jinan, Graduate student, major in condensed matter physics.E-mail:dongtong0126@126.com
Supported by:
National Natural Science Foundation of China(10504019, 10674092)；Shanghai Nano-technology Promotion Center and the Science ＆ Technology Commie of Shanghai Municipality (0652nm046)

摘要/Abstract

摘要：

Gd₅Ge₄低温时具有玻璃态的不稳定性,与钴氧化物La_0.88Sr_0.12CoO₃的冻结的自旋玻璃态不同. 通过分别研究经过零场冷过程后Gd₅Ge₄和La_0.88Sr_0.12CoO₃在低温区域的温度循环对磁化强度的影响,发现在Gd₅Ge₄样品中磁化强度随着温度循环的增加而不断增大,但是在La_0.88Sr_0.12CoO₃样品中温度循环对其磁化强度几乎没有影响.Gd₅Ge₄和La_0.88Sr_0.12CoO₃的直流磁化强度和交流磁化率也进行了测量.Gd₅Ge₄的交流磁化率的峰并不随着频率的增加而向高温区移动,这个现象不同于La_0.88Sr_0.12CoO₃样品的. 通过不同物理参数的测量,证明了Gd₅Ge₄的这种磁玻璃态不同于传统的自旋玻璃态.

关键词: 磁玻璃态, 自旋玻璃, 磁热材料

Abstract:

The metastable property of glasslike dynamics at low temperature of Gd₅Ge₄ was presented in contrast to the stable frozen spin glass state in cobaltite La_0.88Sr_0.12CoO₃(LSCO). Through investigating the effect of temperature cycle on magnetization at the low temperature region after the zero field cooled procedure ofGd₅Ge₄andLa_0.88Sr_0.12CoO₃respectively, it was found that the magnetization continues to increase with increasing the temperature cycle in Gd₅Ge₄, while there was hardly any effect on magnetization inLa_0.88Sr_0.12CoO₃. The dc magnetization and ac susceptibility were also measured on Gd₅Ge₄ and La_0.88Sr_0.12CoO₃. The peaks of ac susceptibility in Gd₅Ge₄ did not move to the higher temperature region with increasing frequency, which were different from the phenomena of La_0.88Sr_0.12CoO₃. This kind of magnetic glass state in Gd₅Ge₄ is quite different from conventional spin glass.

Key words: magnetic glass sate, spin glass, magnetocaloric material

董彤袁淑娟葛军饴洪芳郁黎明曹世勋张金仓. 磁制冷材料Gd₅Ge₄中的磁玻璃态[J]. 山东大学学报(工学版), 2009, 39(3): 67-70.

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磁制冷材料Gd₅Ge₄中的磁玻璃态

The magnetic glass state in the magnetocaloric material Gd5Ge4

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